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Income Taxes (Components of Income Tax Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ 5.2us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State 0.5us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0.3us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0.2us-gaap_CurrentStateAndLocalTaxExpenseBenefit
International 34.5us-gaap_CurrentForeignTaxExpenseBenefit 38.2us-gaap_CurrentForeignTaxExpenseBenefit 27.2us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax provision 40.2us-gaap_CurrentIncomeTaxExpenseBenefit 38.5us-gaap_CurrentIncomeTaxExpenseBenefit 27.4us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal and state 7.7wst_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit 9.2wst_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit 3.3wst_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit
International (0.7)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (7.5)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 2.0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income tax provision 7.0us-gaap_DeferredIncomeTaxExpenseBenefit 1.7us-gaap_DeferredIncomeTaxExpenseBenefit 5.3us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense $ 47.2us-gaap_IncomeTaxExpenseBenefit $ 40.2us-gaap_IncomeTaxExpenseBenefit $ 32.7us-gaap_IncomeTaxExpenseBenefit